Zhukavin, Postnov, Bushuikin, Kudryavtsev, Kovalevsky, Tsyplenkov, Bekin, Lodygin, Portsel, Shuman, Astrov, Abrosimov, Shastin: Long-lived state of a helium-like magnesium donor in silicon
https://arxiv.org/abs/2601.04933 https://arxiv.org/pdf/2601.04933 https://arxiv.org/html/2601.04933